26 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 88 



On August 20, 1903, yellowish cysts 3 mm. in diameter, more or 

 less, were found on the serous coat of the pyloric ceca of a bonito. 

 Some of the deeper cysts were covered with a silvery coat. Most 

 of the ova from these cysts were about 0.018 by 0.011 mm. There 

 was some variation in size. Thus one ovum measured 0.021 by 0.014 

 mm. On July 22, 1926, the liver of a bonito, thickly beset with cysts, 

 was brought to me by Dr. Kudolph Bennett. The older cysts were 

 dark brown and filled with waxy, degenerate tissue; others yellow. 

 While examining a piece of the liver two gasterostomes were noted. 

 Later, after teasing portions of the liver, 250 gasterostomes were 

 secured. A cyst, 3 mm. in diameter, was opened and found to be 

 filled with eggs of this gasterostome. It would appear that the worms 

 make their way from the stomach into the liver by way of the bile 

 duct, in the branches of which they remain free for some time. 

 Ultimately they become centers of irritation which are closed off 

 by walls of connective tissue. 



Five, collected July 26, 1928, from mackerel; viscera of 12 fishes 

 examined. Measurements in balsam: Length, 1.26 mm.; breadth, 

 0.18 mm.; diameter of anterior sucker, 0.07 mm., of ventral sucker, 

 0.04 mm.; anterior end to vitellaria, 0.28 mm., to ventral sucker, 

 0.38 mm. ; ova with thickish shells, 0.015 by 0.009 mm. 



Two, collected by Vinal N. Edwards, June 18, 1913, from cutlass- 

 fish. Lengths in formalin, 1.92 and 2.1 mm. The neck is relatively 

 shorter and thicker than it is in specimens from the bonito. In 

 balsam the vitellaria are seen in lateral view and it is difficult to 

 determine their number ; 32 were counted in one and 28 in the other. 

 Measurements of larger specimen in balsam: Length, 1.68 mm.; 

 breadth, 0.39 mm. ; anterior end to ventral sucker, 0.39 mm. ; diameter 

 of anterior sucker, 0.1 mm., of ventral sucker, 0.07 mm.; ova with 

 thickish shells, 0.018 by 0.012 mm. 



One (U.S.N.M. No. 8170), collected December 18, 1912, from cod- 

 fish ; 10 fishes examined. This specimen, somewhat macerated, is filled 

 with ova, which obscure the anatomy. The cirrus pouch extends to 

 the level of the middle of the second testis. The testes are relatively 

 large, close together, one following the other ; the ovary is separated 

 by a short space from the first testis ; vitellaria largely concealed by 

 the ova, but appear to extend to the first testis, being represented by 

 granules not aggregated into follicles. Dimensions in balsam: 

 Length, 2.33 mm., breadth, 0.24 mm.; diameter of anterior sucker 

 about 0.08 mm. ; ventral sucker, length, 0.07 mm., breadth, 0.06 mm. ; 

 anterior end to first folds of uterus, 0.48 mm., to vitellaria, 0.81 mm. ; 

 ova somewhat variable in size and outline, about 0.21 by 0.012 mm., 

 shells thickish. 



